#define _USE_MATH_DEFINES
#include<cstdio>
#include <iostream>
#include<algorithm>
#include<string>
#include<queue>
#include<vector>
#include<functional>
#include<cmath>
#include<map>
#include<stack>
#include<set>
#include<numeric>

using namespace std;
typedef long long ll;
typedef pair<int, int> Pr;

int n;
int ans;
int num;

int main()
{
	cin >> n;

	string s = to_string(n);
	for (int i = 0; i < s.size(); i++) {
		if (s[i] == '6' || s[i] == '4' || s[i] == '9' || s[i] == '0')
			num++;
		else if (s[i] == '8')
			num+=2;
	}
	if (s.size() > 1)
		ans = (num + 1) * 2 + s.size();
	else{
		ans = num + 1 + s.size();
		if(num == 0)ans++;
	}
	cout << ans << endl;
	return	0;
}